Electrochemical performance of Li-rich cathode material, 0.3Li2MnO3–0.7LiMn1/3Ni1/3Co1/3O2 microspheres with F-doping
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Layered F-doped cathode materials 0.3Li2MnO3–0.7LiMn1/3Ni1/3Co1/3O2−xFx (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) microspheres made up of nanosized primary grains were prepared through co-precipitation method. The sample of x = 0.02 demonstrates a large discharge capacity of 226 mAh·g−1 over 100 cycles at 0.1C and excellent rate performance with discharge capacity of 96 mAh·g−1 at 5.0C and room temperature. Particularly, this material shows much enhanced electrochemical performances even at high temperature of 55 °C. It delivers a quite high discharge capacity of 233.7 mAh·g−1 at 1.0C with capacity retention as high as 97.9% after 100 cycles. The results demonstrate that the fluorine incorporation stabilizes the cathode structure and maintains stable interfacial resistances.
KeywordsLithium-ion battery Cathode materials 0.3Li2MnO3–0.7LiMn1/3Ni1/3Co1/3O2−xFx F-doped
This work was financially supported by the National Natural Science Foundation of China (No. 51372136) and the NSFC-Guangdong United Fund (No. U1401246).
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